EP1006686A1 - Verfahren und Vorrichtung zur Steuerung einer Frequenz durch ein asynchrones Übertragungsnetzwerk und Funktelefonienetzwerk, das die Vorrichtung verwendet - Google Patents

Verfahren und Vorrichtung zur Steuerung einer Frequenz durch ein asynchrones Übertragungsnetzwerk und Funktelefonienetzwerk, das die Vorrichtung verwendet Download PDF

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Publication number
EP1006686A1
EP1006686A1 EP99402641A EP99402641A EP1006686A1 EP 1006686 A1 EP1006686 A1 EP 1006686A1 EP 99402641 A EP99402641 A EP 99402641A EP 99402641 A EP99402641 A EP 99402641A EP 1006686 A1 EP1006686 A1 EP 1006686A1
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EP
European Patent Office
Prior art keywords
offset
range
sequence
reception
frequency
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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EP99402641A
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English (en)
French (fr)
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EP1006686B1 (de
Inventor
Rabih Abouchakra
Henri Symolon
Gérard Vergnaud
Raphael Roux
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Alcatel CIT SA
Alcatel Lucent SAS
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Alcatel CIT SA
Alcatel SA
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Publication of EP1006686A1 publication Critical patent/EP1006686A1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
    • H04J3/0632—Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
    • G06F1/14—Time supervision arrangements, e.g. real time clock

Definitions

  • the present invention finds application in telecommunications and in particular in the realization of a radiotelephone network.
  • this signal is used to define a possible increase or decrease in the frequency of this clock, a variation of this signal modifying this frequency and a variation of this frequency modifying this signal as part of a loop of feedback.
  • This process thus achieves a control of this frequency to that of a reference clock which clock the transmission of packets.
  • This enslavement is such that a possible slow frequency drift of the clock of reference would be reflected on the local clock.
  • This process presents especially the disadvantage of affecting the frequency of the local clock of a jitter at low frequency called in English "wander".
  • the present invention relates to the adjustment of the frequency of a clock. local from that of a reference clock via a network of asynchronous transmission and, in particular it aims to achieve for this to a limited cost a fast, precise and stable control, that is to say in particular free from any annoying jitter.
  • a signal is called “fast” and its transit time is called “minimum” if this time is the shortest or little near the shortest of the transit times for signals received at the network exit asynchronous for a period including the reception of this fast signal.
  • Several such periods may be defined and a minimum transit period may to be searched and found in each of these periods. Such periods are hereinafter called “research periods”.
  • the error signal is formed from time offsets respectively associated with the received signals. Each of these shifts appears between two corresponding and belonging moments, one of a sequence received formed of instants respectively marked by said received signals, and the other to a theoretical sequence defined by said local clock, this instant of the sequence received being the one marked by the signal associated with this offset.
  • the marked moments form a succession to partially random intervals. But, typically, they formed a succession at constant interval in a sequence that these signals have formed when they were issued, this interval being defined from the frequency of reference.
  • the theoretical sequence defined by the local clock then presents it also constant intervals when the frequency of this clock is it even constant.
  • Various means can be used to select the signals fast. Such a means arises if each signal can be provided with a hour mark indicating the time at which it was injected into the transmission. This time is then compared to the time defined by the clock local for the reception of this signal and this comparison allows at least approximately select the fast signals. But this means has the disadvantage of increasing the cost of the process by adding marks hours. This is why, preferably, within the framework of this invention, a received signal is selected as fast signal when the offset associated with this signal has a minimum value in a group of such offsets. This group is formed by the shifts which are associated with the instants of the sequence received included in one of the research periods mentioned above.
  • Figure 1 shows part of a radiotelephone network putting this invention in action.
  • Figure 2 presents a time diagram illustrating the transit of signals between a transmitter and a receiver of the network of figure 1.
  • Figure 3 shows a time diagram illustrating a comparison made in the above receiver.
  • FIG. 4 presents an algorithm implemented in this receiver.
  • Figure 5 presents a diagram showing, for each of the values possible delay of signal transit in a transmission network asyncrhone, the probability density of the occurrence of this value.
  • packets carrying information are transmitted by the network N from transmitter E to receiver R to carry out communication in as part of a telephone set.
  • the timing signals can be made advantageously by these packages, the instant marked by a such a package being for example a start defined by a header of this package.
  • the emission, injection and reception steps mentioned above are then necessary for the realization of communications and their use in the frequency control method does not require any modification of the telephone set.
  • Reception intervals d 1. ... d i appear in this received sequence. Each of them, such as the interval d 1, has a start such as M 1 constituted by one of the reception instants and an end such as M 2 constituted by that of these instants which follows this start in this sequence. These reception times are marked on the axis 91 of FIGS. 2 and 3.
  • the reception intervals are different from each other because the timing network subjected the timing signals to transit times which have varied from one randomly from one signal to another, each of these delays being however at least equal to a basic delay which is imposed by the structure of the network and by the positions of the transmitter and the receiver with respect thereto .
  • the method further includes action steps for adjusting the frequency of the local clock, each of these stages constitutes a terminal stage of a adjustment sequence also including an adjustment group for this step, this group including at least one said calculation range.
  • the calculation ranges of this group respectively constitute adjustment ranges, an offset A cumulative of this group is constituted by the algebraic sum of the shifts of these adjustment ranges.
  • An action of this stage brings to the frequency of the local clock a change more or less depending on whether the offset cumulative of this group is negative or positive, respectively, so this cumulative offset constitutes an error signal as mentioned above.
  • this action and the amplitude of this modification depend in particular on the previous adjustment steps and the absolute value of the cumulative offset so as to achieve a control stable and preferably rapid and precise from the theoretical interval to the interval of reference.
  • This enslavement constitutes the above-mentioned enslavement of the frequency of the local clock to that of the reference clock, or to this last frequency multiplied by a known predetermined number. Its stability, its speed and precision depend in particular on the choice of the ranges of setting.
  • the beginnings and ends of the adjustment ranges are then constituted only by adjustment terminals as defined as indicated above.
  • the terminals B n-1 and B n limit such a duration range Dm.
  • This selection of the calculation ranges used to form the signal has the advantage of removing, or at least greatly reducing, frequency fluctuations which may result from certain variations in transit times imposed on successive timing signals.
  • This advantage results of the selective use of fast signals to determine the limits of these beaches. It is due to a fact that has been recognized and used in the context of this invention and which manifests itself when the above research periods are sufficiently long. This fact is that the difference between the transit times of two signals chosen at random is then made much weaker, by mean, when these two signals are chosen from among the only rapid signals only if these signals had been chosen from among all the signals transmitted.
  • the start such as M 1 of each of these periods such that P n is constituted by the end of the preceding period P n-1 .
  • the origin of search for this period consists of the adjustment terminal B n-1 of a search period P n-1 preceding this period considered in the succession of research periods.
  • An adjustment range then has its beginning and its end respectively constituted by the two adjustment terminals B n-1 and B n of these two periods.
  • the duration "k" of successive search periods is adapted to the traffic of network N. It can be constant. It can however be increased with advantage when it appears that network N is approaching an overload state, this is because it is preferable that a timing signal is only selected if its transit time only slightly exceeds the basic time. A signal having a such transit time will be referred to below as "fast enough". The above advantage then results from the fact that when approaching the overload state, transit times tend to deviate from the basic TTm time. The increase of duration "k” then makes it possible to find in each of the periods of searches for such a signal fast enough despite the decrease in proportion of such signals in the set of timing signals. If the charge of the network N decreases later, the duration "k” is then reduced to a value of base to avoid unnecessary lengthening of the hanging time necessary for bring the frequency of the local clock close to the frequency of reference.
  • a change in the frequency of the local clock could be carried out after each adjustment range, this range then constituting only one setting group.
  • the ranges of each setting group form a succession of tracks, the adjustment sequence including, for each setting range such as Dm of this group, calculating an offset accumulated A of this range.
  • the cumulative offset of the first range of this succession is the offset "am” of this range and the cumulative offset of each of the following ranges is the algebraic sum of the shifts "am” of this next range and the ranges that precede it.
  • An error signal from process is then constituted by the cumulative shift of a range of this group.
  • the adjustment sequences also form a succession.
  • the method then further includes a step of defining a tolerated offset domain, this domain extending between an offset threshold positive and a negative offset threshold typically having the same value absolute S. It also includes a step of defining a succession of increments of respective frequency f for the adjustment sequences.
  • the modification of frequency mentioned above for each setting sequence is then brought only when the cumulative offset A of a range of the group of setting this sequence is outside the tolerated offset range, this modification having an amplitude equal to the frequency increment defined for this sequence.
  • This range then constitutes a last range of this group of setting.
  • the magnitude and the evolution of the frequency increment are determined to ensure the stability, speed and accuracy of the enslavement.
  • the deviation of frequency of the local clock can be large compared to the frequency of reference.
  • the increment "f" then preferably has a high value compared to a basic increment "h” and it increases until a crossing of the reference frequency is detected. Every time that such a crossing has been detected this increment is decreased until being gradually reduced to the basic increment to ensure the stability of the enslavement.
  • this increment first remains constant for a number of groups of setting giving the same direction of progression at frequency F, then it increases to from a value equal to the basic increment multiplied by this same number, this until a new crossing is detected.
  • Another object of this invention is a system for controlling a frequency via an asynchronous transmission network.
  • This system implements the process of the invention. It includes for this the receiver R and the clock local HR and this receiver includes a servo program to execute in essence the instructions summarized in the algorithm of Figure 4.
  • the local clock HR is provided with a setting unit JR phase programmed to carry out a provisional phase agreement of this local clock with a time base external to this system thanks to a exchange of synchronization signals with this time base. This exchange is done via a transmission means imposing delays on these signals constant transit.
  • the system of this invention then constitutes a system of synchronization to obtain a sustainable phase agreement thanks to the frequency control described above.
  • the time base is for example constituted by the clock HE of the transmitter E, this clock being provided with a diffusion unit JE communicating with the JR unit.
  • the transmission means is for example a radio channel.
  • the JR and JE units allow for an initial phase agreement between the HE and HR clocks. They use LE and LR antennas for this. belonging respectively to transmitter E and receiver R. frequency then maintains this agreement with precision acceptable at least for a period after which re-implementation phase is made by these units. This period can be made very long by the enslavement. The latter thus avoids cluttering the radio channel above.
  • the sequence of exchange of the synchronization signals between the JE and JR units can be analogous to that of the NTP protocol described in the publications RFC 1305 and RFC 1361. Such a sequence will be described with the understanding that each instant of transmission or reception of a signal is defined using the clock of the unit which transmits or receives this signal:
  • the JE unit emits a first signal provided with a time mark indicating this time.
  • the JR unit receives this signal and, at one hour H 2 , it emits a second signal provided with time marks indicating the hours H 0 , H 1 and H 2 .
  • the JR unit sets the local clock HR so that the latter indicates the time H 4 + 1/2 RTD for this instant.
  • This invention also relates to a radiotelephone network.
  • a radiotelephone network including a plurality of base stations connected to each other via a asynchronous transmission network N.
  • This network is characterized by the fact that at least one of these base stations constitutes a system as described above.
  • the transmitter E and the receiver R described above are constituted each by one of these base stations.
  • the LE and LR antennas allow this transmitter and this receiver to communicate with the mobile terminals of the network.
  • each of the base stations constituting a receiver such as R handles many communications, i.e. it receives, processes and transmits various packets, the processing operations being able to include modifications, routing etc ...
  • This receiver therefore includes, for carry out these operations, a program which will be called hereinafter program main.
  • program main Whenever a package arrives, this main program is interrupted to implement the mentioned servo program above. This is why, in FIG. 4, the end point of such packets is designated by the word "interruption".
  • the word "return” it designates a return to main program pending the arrival of the next package.
  • Advantages of the invention appear in the case where the stations basis of such a network are close enough to each other that the time frames for transmitting radio waves between subscribers' mobile terminals and base stations are almost negligible.
  • a network local radiotelephone of the European digital transmission network type DECT wireless in which distances between stations are often included between 20 and 500 m and in which each station is equipped with a clock frame synchronization controlled by a clock such as HE and HR and having a frequency of 100 Hz. Maintaining a phase agreement between the clocks frame synchronization is then required to allow transfer (hand over) of a communication between two base stations during a movement of a subscriber participating in this call. This invention facilitates this transfer.
  • this invention allows stabilize the frequency of the latter within a latching time close to one or two minutes.
  • the desired equality between the two frequencies is then achieved with such precision that the time difference between the two clocks of frame synchronization can be maintained below 4,000 ns for a holding time such as two or three minutes.
  • Such a delay allows, for quasi-periodic operations to achieve the phase agreement, easily find available time intervals between two telephone communications in a radio channel provided for such operations.
EP99402641A 1998-12-03 1999-10-25 Verfahren und Vorrichtung zur Steuerung einer Frequenz durch ein asynchrones Übertragungsnetzwerk und Funktelefonienetzwerk, das die Vorrichtung verwendet Expired - Lifetime EP1006686B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9815273A FR2786964B1 (fr) 1998-12-03 1998-12-03 Procede et systeme pour asservir une frequence via un reseau de transmission asynchrone et reseau radiotelephonique incluant ce systeme
FR9815273 1998-12-03

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Publication Number Publication Date
EP1006686A1 true EP1006686A1 (de) 2000-06-07
EP1006686B1 EP1006686B1 (de) 2005-08-24

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US (1) US6819685B1 (de)
EP (1) EP1006686B1 (de)
JP (1) JP2000174821A (de)
AT (1) ATE303022T1 (de)
DE (1) DE69926857T2 (de)
FR (1) FR2786964B1 (de)

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GB2399263A (en) * 2003-03-07 2004-09-08 Zarlink Semiconductor Ltd Clock synchronisation over a packet network
EP1432203A3 (de) * 2002-12-17 2007-12-05 TLS Corporation Niedrige Latenzzeit für digitale Audiopakete über ein paketvermittelndes Netz
US8272600B2 (en) 2008-06-09 2012-09-25 Workrite Ergonomics, Inc. Keyboard and mouse support
CN112116919A (zh) * 2019-06-19 2020-12-22 杭州海康威视数字技术股份有限公司 一种回声消除方法、装置及电子设备

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FI115494B (fi) 1999-09-08 2005-05-13 Nokia Corp Tukiaseman taajuussynkronointi
US7020791B1 (en) * 2002-09-19 2006-03-28 Nortel Networks Limited Clock recovery using a double-exponential smoothing process
GB2400255A (en) * 2003-03-31 2004-10-06 Sony Uk Ltd Video synchronisation
DE10326336B4 (de) * 2003-06-11 2006-06-29 Infineon Technologies Ag Vorrichtung und Verfahren zum zeitlichen Steuern der Verarbeitung eines Funksignals in einer Mobilstation
US6977615B2 (en) * 2004-03-04 2005-12-20 Omron Automotive Electronics, Inc. Microstrip antenna for RF receiver
EP2026485A1 (de) * 2007-08-17 2009-02-18 Nokia Siemens Networks Oy Verfahren und Vorrichtung zur paketbasierten Taktwiederherstellung
CN101674174B (zh) * 2008-09-12 2013-06-05 华为技术有限公司 一种提高时钟稳定度的方法及设备
CN101986595A (zh) * 2010-11-01 2011-03-16 中兴通讯股份有限公司 时间同步方法及节点
GB2489002A (en) * 2011-03-14 2012-09-19 Nujira Ltd Delay adjustment to reduce distortion in an envelope tracking transmitter
CN102412954B (zh) * 2011-11-19 2014-10-22 西安邮电学院 一种分组网中时钟频率同步方法
CN105892560A (zh) * 2016-03-29 2016-08-24 杭州和利时自动化有限公司 一种用于嵌入式系统的时钟检测方法及系统
CN110196997B (zh) * 2019-04-30 2024-04-26 中国电力科学研究院有限公司 一种电磁暂态异步并行计算方法及装置

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EP1432203A3 (de) * 2002-12-17 2007-12-05 TLS Corporation Niedrige Latenzzeit für digitale Audiopakete über ein paketvermittelndes Netz
US7555017B2 (en) 2002-12-17 2009-06-30 Tls Corporation Low latency digital audio over packet switched networks
US7970019B2 (en) 2002-12-17 2011-06-28 Tls Corporation Low latency digital audio over packet switched networks
GB2399263A (en) * 2003-03-07 2004-09-08 Zarlink Semiconductor Ltd Clock synchronisation over a packet network
EP1455473A2 (de) * 2003-03-07 2004-09-08 Zarlink Semiconductor Limited Taktsynchronisierung über einem Paketnetzwerk
EP1455473A3 (de) * 2003-03-07 2005-12-07 Zarlink Semiconductor Limited Taktsynchronisierung über einem Paketnetzwerk
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US7817673B2 (en) 2003-03-07 2010-10-19 Zarlink Semiconductor Limited Clock synchronisation over a packet network
US8272600B2 (en) 2008-06-09 2012-09-25 Workrite Ergonomics, Inc. Keyboard and mouse support
CN112116919A (zh) * 2019-06-19 2020-12-22 杭州海康威视数字技术股份有限公司 一种回声消除方法、装置及电子设备

Also Published As

Publication number Publication date
DE69926857D1 (de) 2005-09-29
US6819685B1 (en) 2004-11-16
JP2000174821A (ja) 2000-06-23
FR2786964B1 (fr) 2001-01-05
DE69926857T2 (de) 2006-06-08
EP1006686B1 (de) 2005-08-24
FR2786964A1 (fr) 2000-06-09
ATE303022T1 (de) 2005-09-15

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